in oak-lucene/src/main/java/org/apache/lucene/codecs/DocValuesConsumer.java [418:632]
public void mergeSortedSetField(FieldInfo fieldInfo, final MergeState mergeState, List<SortedSetDocValues> toMerge) throws IOException {
final AtomicReader readers[] = mergeState.readers.toArray(new AtomicReader[toMerge.size()]);
final SortedSetDocValues dvs[] = toMerge.toArray(new SortedSetDocValues[toMerge.size()]);
// step 1: iterate thru each sub and mark terms still in use
TermsEnum liveTerms[] = new TermsEnum[dvs.length];
for (int sub = 0; sub < liveTerms.length; sub++) {
AtomicReader reader = readers[sub];
SortedSetDocValues dv = dvs[sub];
Bits liveDocs = reader.getLiveDocs();
if (liveDocs == null) {
liveTerms[sub] = dv.termsEnum();
} else {
LongBitSet bitset = new LongBitSet(dv.getValueCount());
for (int i = 0; i < reader.maxDoc(); i++) {
if (liveDocs.get(i)) {
dv.setDocument(i);
long ord;
while ((ord = dv.nextOrd()) != SortedSetDocValues.NO_MORE_ORDS) {
bitset.set(ord);
}
}
}
liveTerms[sub] = new BitsFilteredTermsEnum(dv.termsEnum(), bitset);
}
}
// step 2: create ordinal map (this conceptually does the "merging")
final OrdinalMap map = new OrdinalMap(this, liveTerms);
// step 3: add field
addSortedSetField(fieldInfo,
// ord -> value
new Iterable<BytesRef>() {
@Override
public Iterator<BytesRef> iterator() {
return new Iterator<BytesRef>() {
final BytesRef scratch = new BytesRef();
long currentOrd;
@Override
public boolean hasNext() {
return currentOrd < map.getValueCount();
}
@Override
public BytesRef next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
int segmentNumber = map.getFirstSegmentNumber(currentOrd);
long segmentOrd = map.getFirstSegmentOrd(currentOrd);
dvs[segmentNumber].lookupOrd(segmentOrd, scratch);
currentOrd++;
return scratch;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
};
}
},
// doc -> ord count
new Iterable<Number>() {
@Override
public Iterator<Number> iterator() {
return new Iterator<Number>() {
int readerUpto = -1;
int docIDUpto;
int nextValue;
AtomicReader currentReader;
Bits currentLiveDocs;
boolean nextIsSet;
@Override
public boolean hasNext() {
return nextIsSet || setNext();
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
@Override
public Number next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
assert nextIsSet;
nextIsSet = false;
// TODO make a mutable number
return nextValue;
}
private boolean setNext() {
while (true) {
if (readerUpto == readers.length) {
return false;
}
if (currentReader == null || docIDUpto == currentReader.maxDoc()) {
readerUpto++;
if (readerUpto < readers.length) {
currentReader = readers[readerUpto];
currentLiveDocs = currentReader.getLiveDocs();
}
docIDUpto = 0;
continue;
}
if (currentLiveDocs == null || currentLiveDocs.get(docIDUpto)) {
nextIsSet = true;
SortedSetDocValues dv = dvs[readerUpto];
dv.setDocument(docIDUpto);
nextValue = 0;
while (dv.nextOrd() != SortedSetDocValues.NO_MORE_ORDS) {
nextValue++;
}
docIDUpto++;
return true;
}
docIDUpto++;
}
}
};
}
},
// ords
new Iterable<Number>() {
@Override
public Iterator<Number> iterator() {
return new Iterator<Number>() {
int readerUpto = -1;
int docIDUpto;
long nextValue;
AtomicReader currentReader;
Bits currentLiveDocs;
boolean nextIsSet;
long ords[] = new long[8];
int ordUpto;
int ordLength;
@Override
public boolean hasNext() {
return nextIsSet || setNext();
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
@Override
public Number next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
assert nextIsSet;
nextIsSet = false;
// TODO make a mutable number
return nextValue;
}
private boolean setNext() {
while (true) {
if (readerUpto == readers.length) {
return false;
}
if (ordUpto < ordLength) {
nextValue = ords[ordUpto];
ordUpto++;
nextIsSet = true;
return true;
}
if (currentReader == null || docIDUpto == currentReader.maxDoc()) {
readerUpto++;
if (readerUpto < readers.length) {
currentReader = readers[readerUpto];
currentLiveDocs = currentReader.getLiveDocs();
}
docIDUpto = 0;
continue;
}
if (currentLiveDocs == null || currentLiveDocs.get(docIDUpto)) {
assert docIDUpto < currentReader.maxDoc();
SortedSetDocValues dv = dvs[readerUpto];
dv.setDocument(docIDUpto);
ordUpto = ordLength = 0;
long ord;
while ((ord = dv.nextOrd()) != SortedSetDocValues.NO_MORE_ORDS) {
if (ordLength == ords.length) {
ords = ArrayUtil.grow(ords, ordLength+1);
}
ords[ordLength] = map.getGlobalOrd(readerUpto, ord);
ordLength++;
}
docIDUpto++;
continue;
}
docIDUpto++;
}
}
};
}
}
);
}